Homeowners Insurance Replacement Cost Calculator
Estimate the replacement cost (Coverage A) of your home for accurate homeowners insurance — separate from market value, land value, or county assessment.
Replacement Cost vs Market Value vs Assessment
Three different numbers, three different uses. Replacement cost is the price to rebuild your home as-is with current materials and labor — what your insurance must cover. Market value is what a buyer would pay today for the home AND the land — drops can happen even when replacement cost rises. Tax assessment is the county's value for property tax — usually 60-80% of market value due to assessment limits.
Insurance must use replacement cost, not the other two. A $400,000 market-value home on a $150,000 lot might have only $250,000 in replacement cost. Conversely, a $400,000 market-value home on a $50,000 lot in a soft market might have $350,000+ in replacement cost. Source: National Association of Insurance Commissioners (naic.org). Last updated: May 2026.
Why Underinsurance Is the #1 Homeowner Mistake
Most policies include a coinsurance clause requiring you to insure at least 80% of replacement cost. If you're below that threshold and have a partial loss, your claim payment is reduced proportionally — even if the loss is within your policy limit. Example: $300,000 replacement cost home insured for $200,000 (67% of RC, below the 80% threshold). A $50,000 fire claim pays only ($200K ÷ $240K) × $50K = $41,667 minus deductible. You eat the difference.
Regional Cost Variations in 2026
Construction costs vary 30-50% across US regions. Hawaii and Alaska are highest ($270+/sq ft baseline) due to shipping costs. West Coast and Northeast run $190-$215/sq ft for standard construction. Midwest and South are $145-$170/sq ft. Inflation-Guard endorsements automatically increase Coverage A each renewal by 4-6% — essential in fast-rising markets but still requires periodic recalculation.
Extended and Guaranteed Replacement Cost Endorsements
Two upgrades worth the small premium: Extended Replacement Cost (ERC) adds 25-50% above Coverage A automatically — covers cost overruns after total losses (common during regional disasters when contractor demand spikes). Guaranteed Replacement Cost (GRC) covers full rebuild regardless of policy limit — gold standard but only available from carriers like Chubb, USAA, AAA. Both endorsements add about 2-5% to the annual premium and can save you tens of thousands after a total loss.
Frequently Asked Questions
Why is my home insurance Coverage A different from my home's market value?
Insurance covers the cost to rebuild the structure, not buy the property. Market value includes the land, which doesn't burn down. A typical home's land represents 20-40% of the market value \u2014 so your Coverage A is usually significantly less than your purchase price.
What is the 80% coinsurance rule?
Most homeowners policies require you to insure at least 80% of the home's replacement cost. If you fall below this threshold, partial-loss claims are paid out proportionally \u2014 you suffer a reduction equal to your underinsurance percentage. The rule is in the policy declarations under 'coinsurance clause' or 'insurance-to-value requirement.'
How often should I update my replacement cost?
Every 3 years minimum, or after any significant renovation (added square footage, kitchen/bath remodel, new roof). Construction costs have risen sharply since 2020 \u2014 a 2019 replacement cost estimate is likely 30-40% too low for 2026 rebuild reality.
Does Coverage A include detached structures?
No. Detached structures (sheds, garages, fences, gazebos) are covered under Coverage B (Other Structures), typically defaulted to 10% of Coverage A. If you have substantial detached structures, request a higher Coverage B percentage.
What is 'cost to rebuild' missing that most people forget?
Site work and demolition. After a total loss, you must clear debris ($10-$25 per sq ft typically), bring in temporary utilities, pay for permits and architectural plans, and sometimes upgrade to current building code. Add 10-15% above the per-sq-ft construction estimate for these costs \u2014 or get Extended Replacement Cost coverage.
Is Extended Replacement Cost or Guaranteed Replacement Cost worth the extra premium?
Yes. They cost 2-5% more in premium but cover cost overruns during a total loss. After major disasters (wildfires, hurricanes), construction costs in the disaster zone often spike 30-50% from contractor scarcity. ERC/GRC protects you from this. Critical for areas with wildfire or hurricane exposure.